[Sirisian]

I don't like the idea of the main cannon being used for more than AV damage. It's important to keep the roles of vehicles specific. You end up treading into BFR territory when you allow a vehicle to become both a strong AV or AI vehicle. (Debatable if this is bad).

Also the whole reason for having secondary gunners is to offset the weakness of AV. For instance if a driver is using a vehicle they're only commanding the main cannon. Suddenly if an AV user drops in on a tank they're weak. They'd either try to hit the AV user or run away because the turret won't rotate fast enough. If they have a gunner manning AI rocket batteries on the top, for instance, they don't have to worry. Suddenly their weakness to AI is handled. (They still have a weakness to AA).

This as a whole creates a sense of symbiotic teamwork where player work together to offset their weaknesses.

Also if this isn't obvious, tanks should be fighting vehicles. Not infantry. That is vehicles should be balanced against vehicles, not infantry.